i like the idea but what about spiv gpiv lpiv (liquid/gas/solid powered invisible) and sinv ginv linv (liquid/gas/solid invisible)only letting gas solid or liquid through

@Arien742474247 (View Post)
While those may sound good at first, they can easily be replicated using the current walls we have.

@Arien742474247 (View Post)
Maybe sparking with iron makes it solid, metal makes it liquid and um.... Insulated wire makes it gas